It's always sad, frustrating and disappointing when a player, especially one with a chance to start, is lost for the year in preseason action.
"It saddens me to say my season has officially come to an end. A torn ACL is a serious injury, but not one I can’t recover from. I will undergo surgery to repair the damage and take the necessary steps towards a full recovery.
"I am confident I will be able to return next season with the same speed and explosiveness you have seen from me in the past.
"Thanks for all of the support and well wishes."
Darling is expected to meet with doctors this week to schedule a time for surgery. The Chiefs officially placed him on IR on Tuesday effectively ending his season.
He was listed with the first team on the Chiefs depth chart and spent much of training camp running with the first team.
He is under contract with the Chiefs through 2010 at base salaries of $1 million and $2 million.